It pays not to take everything you read too literally, this Forum excepted !! I can find nothing about Ramipril heightening allergic reactions ??
There are many contra-indications, side effects and risks associated with all sorts of drugs. The GP/Consultant will know all about this and if he prescribes it for you especially if under the instructions of the Renal Clinic I would be inclined not to worry about this. It does have the ability to protect your kidneys and is only contra-indicated in the following circumstances. If they don't apply to you then don't worry about it. In any case, you can always discuss this with the prescriber.
From the BNF59.
ACE inhibitor treatment is unlikely to have an adverse effect on overall renal function in patients with severe unilateral renal artery stenosis and a normal contralateral kidney, but glomerular filtration is likely to be reduced (or even abolished) in the affected kidney and the long-term consequences are unknown.
ACE inhibitors are therefore best avoided in patients with known or suspected renovascular disease, unless the blood pressure cannot be controlled by other drugs. If ACE inhibitors are used, they should be initiated only under specialist supervision and renal function should be monitored regularly.
ACE inhibitors should also be used with particular caution in patients who may have undiagnosed and clinically silent renovascular disease. This includes patients with peripheral vascular disease or those with severe generalised atherosclerosis.
As for the bit about Potassium levels........
Do not use salt substitutes containing potassium or potassium supplements without consulting your doctor. Altace can cause increased potassium levels in your blood, especially if you have diabetes and kidney problems. Blood tests should pick this up.
Hope that helps.
Ken